﻿// Copyright (c) Matthias Koch
//
// See the NOTICE file distributed with this work for additional information
// regarding copyright ownership.  rubicon licenses this file to you under 
// the Apache License, Version 2.0 (the "License"); you may not use this 
// file except in compliance with the License.  You may obtain a copy of the 
// License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the 
// License for the specific language governing permissions and limitations
// under the License.
// 
using System;
using System.Collections.Generic;
using System.Linq;

using PostSharp.Aspects;
using PostSharp.Aspects.Configuration;
using PostSharp.Aspects.Serialization;

namespace XValidation
{
  /// <summary>
  /// Acts as an <see cref="IAspectProvider"/> that applies <see cref="ValidationAttribute"/>s to appropriate targets.
  /// </summary>
  [Serializable]
  [AspectConfiguration (SerializerType = typeof (MsilAspectSerializer))]
  public class ApplyValidationAttribute : TypeLevelAspect, IAspectProvider
  {
    private readonly IValidationInfoProvider _validationInfoProvider;

    public ApplyValidationAttribute ()
    {
      _validationInfoProvider = new ValidationInfoProvider();
    }

    public IEnumerable<AspectInstance> ProvideAspects (object targetElement)
    {
      var targetType = (Type) targetElement;

      return from m in targetType.GetMethods ()
             where _validationInfoProvider.GetValidationItems(m).Any()
             select new AspectInstance (m, new ValidationAttribute ());
    }
  }
}